Security Technique To Prevent Port Knocking And Illegal Access in SDN

The progress of networking technology has led to a new paradigm of network control based on data plane programmability. This allows for flexible packet processing and improved network management, which increases network security. Literature lacks network security methods for authentication and blocking illegal access. In this study, we aim to prevent assaults in a two-level defense. The first level is a dynamic firewall mechanism that stops packets from untrusted sources. The second level is dynamic port banging. Both security levels were evaluated in a simulated P4 environment. The controller receives packets from unknown hosts. The controller uses ACL rules to allow or reject packets. Each new host generates a random sequence for port knocking. Hosts may only connect in the order given. This solution works better than earlier P4-based firewall systems owing to two security layers. Moreover, it blocks unwanted network access to mitigate certain security threats.